1. Space Shuttle Challenger

The truth behind the NASA rocket disaster of 1986 that killed seven US astronauts. Why did the launch go ahead after NASA engineers called for it to be cancelled?

2. Fukushima earthquake and tsunami (Pt.1)

In March 2011, Japan was hit by a devastating tsunami killing 20,000 and triggering a nuclear meltdown. Survivors and witnesses tell their extraordinary stories.

3. Fukushima earthquake and tsunami (Pt.2)

The tsunami provokes a major meltdown at the local nuclear facility. What happened to the safeguards? What went wrong at Fukushima?

4. Chernobyl nuclear disaster (Pt.1)

In April 1986, a huge explosion at Chernobyl blasted radioactive dust into the atmosphere

6. Air France Concorde crash

On the 25th July 2000, a Concorde leaving Paris for New York caught fire on take-off before crashing to the ground. But why? Investigators and loved ones recall the tragedy.